公开(公告)号：FR2392136A1

公开(公告)日：1978-12-22

申请号：FR7808156

申请日：1978-03-21

Applicant: HUGHES TOOL CO

Inventor： SCALES STANLEY R

IPC: C09D5/00 ,  C09D167/08 ,  C21D1/72 ,  C23C8/04 ,  C23C9/00

Abstract: Disclosed herein is a method of selectively boronizing of the surface of ferrous metal that is characterized by applying to such area as is not to be boronized a coating consisting essentially of finely divided titanium dioxide, finely divided carbonaceous material and an anhydrous binding agent in effective amounts to form a boronizing resist having boronizing resistance during boronizing, then boronizing the ferrous metals at a temperature at which the coating forms the boronizing resist and subsequently removing the boronizing resist. Also disclosed are compositions for preferred applications of the coating and additional details on preferred embodiments.

公开(公告)号：CA1003817A

公开(公告)日：1977-01-18

申请号：CA194786

申请日：1974-03-12

Applicant: HUGHES TOOL CO

Inventor： DILL HERBERT C ,  SCALES STANLEY R

IPC: C21D9/22 ,  C23C8/00 ,  E21B10/50

Abstract: 1455951 Making drill bit cutters HUGHES TOOL CO 17 May 1974 [10 Aug 1973] 22080/74 Heading B3A [Also in Divisions C7 and E1] A method of manufacturing steel rotatable cutters for earth boring drill bits comprises forming a cutter with exterior earth disintegrating teeth carburizing at least selected areas of the exterior of the cutter to form a carburized case, boronizing the carburized case, and heat treating the carburized case. The heat treating comprises hardening and tempering the teeth. A drill bit 11, Fig. 1, has a threaded shank 13, nozzles 15 and head sections 17 each supporting a rotatable cutter 19. Alternatively, a conical cutter 19 may be mounted on the head section via a bearing pin 35, Fig. 3, and has teeth 25, 31, and a spear point 33. The carburizing may be by gas, pack or liquid and the carburization is for 19 hours at 927‹ C. The boronizing process may also be performed by pack, gas or liquid methods at temperatures of 700 to 900‹ C. for times of 15 minutes to 36 hours. The hardening comprises quenching in oil from at least 755‹ C. or quenching in carburizing or reducing atmospheres from a temperature of 780-843‹ C. Tempering is effected at 143-266‹ C. for about an hour. Decarburization or oxidation of the boronized case may be prevented by using a carburizing or reducing atmosphere, or by using a coating, e.g. copper plating. An alternative form of cutter, Fig. 4 (not shown), comprises rows of wear resistant inserts, preferably formed of cemented WC with a cobalt binder, having an interference fit in holes drilled in the cone 19.

公开(公告)号：CA968339A

公开(公告)日：1975-05-27

申请号：CA162555

申请日：1973-01-31

Applicant: HUGHES TOOL CO

Inventor： SCALES STANLEY R ,  PRINCE RICHARD B

IPC: C21D9/22 ,  C23C8/22 ,  E21B10/22

公开(公告)号：CA1066999A

公开(公告)日：1979-11-27

申请号：CA248997

申请日：1976-03-29

Applicant: HUGHES TOOL CO

Inventor： SCALES STANLEY R

IPC: C23C8/00 ,  E21B10/22 ,  C23C11/12

Abstract: Disclosed herein is an improved method of finishing a steel article having a carburized and boronized case. The article is carburized to a selected depth then finished to a smoothness which is smoother than the desired final finish. The article is then boronized, hardened and tempered. Further finishing is unnecessary.

公开(公告)号：CA1009645A

公开(公告)日：1977-05-03

申请号：CA219082

申请日：1975-01-30

Applicant: HUGHES TOOL CO

Inventor： DILL HERBERT C ,  SCALES STANLEY R

IPC: E21B10/52 ,  E21B10/56

公开(公告)号：CA1006869A

公开(公告)日：1977-03-15

申请号：CA194785

申请日：1974-03-12

Applicant: HUGHES TOOL CO

Inventor： SCALES STANLEY R

IPC: C23C8/00 ,  E21B10/22

Abstract: Disclosed herein are treatments for the manufacture of wear resistant steel surfaces, which are carburized, boronized, quenched and tempered for extreme surface hardness, with a strong, tough supporting base that minimizes fracturing of the brittle boronized case.

公开(公告)号：CA707637A

公开(公告)日：1965-04-13

申请号：CA707637D

Applicant: HUGHES TOOL CO

Inventor： WISLER ALLEN E ,  SCALES STANLEY R